Display device

ABSTRACT

The present invention is directed to providing a technology for display devices where a transparent cover is pasted on a display panel according to which inconsistencies resulting from expansion of the polarizing plate in the vicinity of an end portion caused by moisture can be prevented, and the adhesive can be prevented from sagging when the display panel and the transparent cover are pasted together. A display device according to the invention is provided with: a liquid crystal display panel having a first substrate, a second substrate provided on the viewer side of the above described first substrate and a liquid crystal layer sandwiched between the above described first substrate and the above described second substrate; and a transparent cover pasted on the surface of the above described liquid crystal display panel on the above described viewer side using an adhesive. The above described liquid crystal display panel has a polarizing plate between the above described second substrate and the above described transparent cover. The above described adhesive covers the entirety of a side of the above described polarizing plate, and the form of the outer periphery of the above described adhesive in a plane is uneven.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a Divisional application of U.S. application Ser.No. 12/232,173 filed on Sep. 11, 2008. The present application claimspriority from U.S. application Ser. No. 12/232,173 filed on Sep. 11,2008, which claims priority from Japanese Application 2007-236102 filedon Sep. 12, 2007, the content of which is hereby incorporated byreference into this application.

BACKGROUND OF THE INVENTION

(1) Field of the Invention

The present invention relates to a display device where a transparentcover is pasted on the surface of a display panel using an adhesive.

(2) Related Art Statement

Liquid crystal display devices having a liquid crystal display panel,for example, are known as display devices. In many cases, a transparentcover, such as of an acryl resin, is provided on such a liquid crystaldisplay panel on the viewer side (front side). This transparent coverworks as a protective cover plate. However, the transparent cover isprovided at a predetermined distance from the liquid crystal displaypanel, and therefore, there is an air layer between the transparentcover and the liquid crystal display panel. Therefore, there isunnecessary interface reflection, due to the difference in the index ofrefraction in the interface with the air layer, which is a factoraffecting lowering of contrast in the display.

In order to solve this, a technology according to which a transparentcover is pasted on the surface of a liquid crystal display panel usingan adhesive has been proposed. FIG. 11 is a cross sectional diagramshowing the configuration of a conventional liquid crystal displaydevice.

The liquid crystal display panel shown in FIG. 11 has a configurationwhere a first substrate SUB1 and a second substrate SUB2 are pastedtogether via a sealing material SL, and a liquid crystal layer LC issandwiched between the first substrate SUB1 and the second substrateSUB2. In addition, a polarizing plate POL1 and a polarizing plate POL2are provided on the first substrate SUB1 on the side opposite to theliquid crystal layer LC and on the second substrate SUB2 on the sideopposite to the liquid crystal layer LC, respectively.

A transparent cover COV is pasted on the surface of the liquid crystaldisplay panel on the viewer side using an adhesive ADH. The transparentcover COV is provided with a light blocking film BLK on the outside ofthe display region AR of the liquid crystal display panel. In addition,in the case where an adhesive ADH of which the index of refraction isclose to that of the transparent cover COV is used, there is no airlayer, and therefore, unnecessary reflection in the interface resultingfrom the index of refraction can be prevented, and the contrast in thedisplay can be increased.

In addition to the conventional configuration shown in FIG. 11, priorart relating to the present invention are disclosed in the followingPatent Documents 1 and 2, for example.

-   (Patent Document 1) Japanese Unexamined Patent Publication    2007-178758-   (Patent Document 2) Japanese Unexamined Patent Publication    2006-221187

SUMMARY OF THE INVENTION

FIG. 12 is a cross sectional diagram illustrating a problem with theconventional liquid crystal display device shown in FIG. 11. In the caseof the conventional configuration shown in FIG. 11, the end portion ofthe adhesive ADH and the end portion of the polarizing plate POL2approximately coincide, and therefore, the side of the polarizing platePOL2 is exposed. As a result, as shown in FIG. 12, moisture enters fromthe side of the polarizing plate POL2, and a problem arises, such thatthe polarizing plate POL2 expands in the vicinity of the end portion.

In general, the transparent cover COV is thicker than the secondsubstrate SUB2. Accordingly, the transparent cover COV barely deformsunder the stress caused by the expansion of the polarizing plate POL2 inthe vicinity of the end portion, and the second substrate SUB2 deformsin such a manner as to bulge out toward the first substrate SUB1 side inthe vicinity of the end portion of the second substrate SUB2. Thisdeformation becomes severe as the adhesive ADH becomes thinner. As aresult of the deformation, there is an inconsistent gap region IRG wherethe thickness of the liquid crystal layer LC changes. When thisinconsistent gap region IRG reaches the inside of the display region AR,a problem arises, such that yellowish, frame-like inconsistency, forexample, appears in the display.

Patent Documents 1 and 2 do not describe any such problem of thepolarizing plate expanding in the vicinity of the end portion, butdisclose a configuration where the adhesive protrudes from thepolarizing plate so as to cover the side of the polarizing plate.

In the case of the configuration shown in Patent Documents 1 and 2, whenthe transparent cover and the liquid crystal display panel shift inposition at the time of pasting, a problem arises, such that theadhesive protrudes and sags from the substrate on the upper side(corresponding to the second substrate SUB2 in FIG. 11).

Protection of the drive circuit in the case where the drive circuit ismounted on the first substrate SUB1 is not taken into consideration forthe configuration shown in FIG. 11 and Patent Documents 1 and 2. In thecase where the drive circuit mounted on the display panel is coveredwith a transparent cover, there is a gap between the transparent coverand the drive circuit, and therefore, there is a possibility of thetransparent cover cracking when the region on which the drive circuit ismounted or the vicinity thereof is pressed.

In addition, there is also a problem with the configuration shown inFIG. 11 and Patent Documents 1 and 2, such that it is difficult tosufficiently harden the adhesive ADH in the region where the transparentcover COV overlaps with the light blocking film BLK in the case where anadhesive which can be hardened through irradiation with light, forexample an ultraviolet ray curing type adhesive, or an adhesive havingthe properties of both thermosetting type and ultraviolet ray curingtype adhesives is used as the adhesive ADH.

In addition, these problems are not limited to the liquid crystaldisplay devices using a liquid crystal display panel, and could occur indisplay devices using a display panel of another type.

The above described and other problems will become clearer from thedescriptions throughout the entirety of the present specification andthe drawings.

Means for Solving Problem

In an example of the display device according to the present invention,the entirety of the sides of the polarizing plate is coated with anadhesive for pasting the transparent cover to the display panel, forexample. At this time, the form of the outer periphery of the adhesivein a plane is uneven.

In another example of the display device according to the presentinvention, the drive circuit mounted on the display panel is coated witha transparent cover, for example. At this time, the adhesive is alsobetween the transparent cover and the drive circuit.

In still another example of the display device according to the presentinvention, an opening is created in the light blocking film of thetransparent cover in the case where an adhesive which can be hardenedthrough irradiation with light is used as the adhesive for pasting thetransparent cover to the display panel, for example.

The following configuration can be provided for the present invention,for example.

(1) A display device has:

a liquid crystal display panel having a first substrate, a secondsubstrate provided on the viewer side of the above described firstsubstrate and a liquid crystal layer sandwiched between the abovedescribed first substrate and the above described second substrate; and

a transparent cover pasted on the surface of the above described liquidcrystal display panel on the above described viewer side using anadhesive, and

the above described liquid crystal display panel has a polarizing platebetween the above described second substrate and the above describedtransparent cover,

the above described adhesive covers the entirety of a side of the abovedescribed polarizing plate, and

the form of the outer periphery of the above described adhesive in aplane is uneven.

(2) In the same structure as in (1), the thickness of the abovedescribed adhesive between the above described transparent cover and theabove described polarizing plate may be in a range from 30 μm to 200 μm,and

the amount of the above described adhesive protruding from around theabove described polarizing plate may be 0.1 mm or more even where itprotrudes the least.

(3) In the same structure as in (1), the thickness of the abovedescribed adhesive between the above described transparent cover and theabove described polarizing plate may be in a range from 30 μm to 100 μm,and

the amount of the above described adhesive protruding from around theabove described polarizing plate may be 0.1 mm or more even where itprotrudes the least.

(4) In the same structure as in any of (1) to (3), the above describedliquid crystal display panel may have a sealing material for pasting theabove described first substrate and the above described second substratetogether, which is provided around the display region, and

an end portion of the above described polarizing plate may overlap withthe above described sealing material.

(5) In the same structure as in any of (1) to (3), the above describedliquid crystal display panel may have a sealing material for pasting theabove described first substrate and the above described second substratetogether, which is provided around the display region, and

an end portion of the above described polarizing plate may be located onthe side closer to the above described display region than the abovedescribed sealing material.

(6) In the same structure as in any of (1) to (5), a drive circuit maybe mounted in a region of the above described first substrate whichprotrudes from the above described second substrate,

the above described transparent cover may cover the above describeddrive circuit, and

the above described adhesive may be provided between the above describedtransparent cover and the above described drive circuit.

(7) In the same structure as in any of (1) to (6), the above describedtransparent cover may have a light blocking film in the region where theabove described drive circuit is mounted,

the above described adhesive may be an adhesive which can be curedthrough irradiation with light, and

the above described light blocking film may have an opening in a portionof the region where the above described drive circuit is mounted.

(8) In the same structure as in any of (1) to (7), the above describedtransparent cover may function as a touch panel.

(9) A display device has:

a liquid crystal display panel having a first substrate, a secondsubstrate provided on the viewer side of the above described firstsubstrate and a liquid crystal layer sandwiched between the abovedescribed first substrate and the above described second substrate; and

a transparent cover pasted on the surface of the above described liquidcrystal display panel on the above described viewer side using anadhesive, and

the above described liquid crystal display panel has a polarizing platebetween the above described second substrate and the above describedtransparent cover,

the above described adhesive covers the entirety of a side of the abovedescribed polarizing plate,

a drive circuit is mounted in a region of the above described firstsubstrate which protrudes from the above described second substrate,

the above described transparent cover covers the above described drivecircuit, and

the above described adhesive is provided between the above describedtransparent cover and the above described drive circuit.

(10) In the same structure as in (9), the above described transparentcover may have a light blocking film in the region where the abovedescribed drive circuit is mounted,

the above described adhesive may be an adhesive which can be curedthrough irradiation with light, and

the above described light blocking film may have an opening in a portionof the region where the above described drive circuit is mounted.

(11) In the same structure as in (9) or (10), the form of the outerperiphery of the above described adhesive in a plane may be uneven.

(12) In the same structure as in any of (9) to (11), the thickness ofthe above described adhesive between the above described transparentcover and the above described polarizing plate may be in a range from 30μm to 200 μm, and

the amount of the above described adhesive protruding from around theabove described polarizing plate may be 0.1 mm or more even where itprotrudes the least.

(13) In the same structure as in any of (9) to (11), the thickness ofthe above described adhesive between the above described transparentcover and the above described polarizing plate may be in a range from 30μm to 100 μm, and

the amount of the above described adhesive protruding from around theabove described polarizing plate may be 0.1 mm or more even where itprotrudes the least.

(14) In the same structure as in any of (9) to (13), the above describedliquid crystal display panel may have a sealing material for pasting theabove described first substrate and the above described second substratetogether, which is provided around the display region, and

an end portion of the above described polarizing plate may overlap withthe above described sealing material.

(15) In the same structure as in any of (9) to (13), the above describedliquid crystal display panel may have a sealing material for pasting theabove described first substrate and the above described second substratetogether, which is provided around the display region, and

an end portion of the above described polarizing plate may be located onthe side closer to the above described display region than the abovedescribed sealing material.

(16) In the same structure as in any of (9) to (15), the above describedtransparent cover may function as a touch panel.

(17) A display device has:

a display panel; and

a transparent cover pasted on the surface of the above described displaypanel on the viewer side using an adhesive, and

the above described transparent cover has a light blocking film,

the above described adhesive is an adhesive which can be hardenedthrough irradiation with light,

the above described light blocking film of the above describedtransparent cover has a window from which a display region of the abovedescribed display panel is exposed and an opening provided in anotherlocation from the above described window, and

the above described adhesive at least partially overlaps with the abovedescribed opening of the above described light blocking film.

(18) In the same structure as in (17), a drive circuit may be mountedalong at least one side of the above described display panel,

the above described transparent cover may cover the above describeddrive circuit,

the above described adhesive may also be between the above describedtransparent cover and the above described drive circuit, and

the above described light blocking film along the above described sidewhere the above described drive circuit may be mounted from among theabove described light blocking film of the above described transparentcover has the above described opening.

(19) In the same structure as in (17) or (18), the above describeddisplay panel may be a liquid crystal display panel.

(20) In the same structure as in any of (17) to (19), the abovedescribed transparent cover may function as a touch panel.

Here, the above described configurations are mere examples, andappropriate modifications of the present invention are possible withinsuch a scope as not to deviate from the technical idea. In addition,examples of the configuration of the present invention other than thosedescribed above will be clarified in the description throughout theentirety of the present specification and the drawings.

Effects of the Invention

Typical effects of the present invention are as follows.

According to the present invention, the entirety of the sides of apolarizing plate is covered with the adhesive for pasting thetransparent cover to the display panel, and therefore, inconsistency inthe display resulting from expansion of the polarizing plate in thevicinity of an end portion caused by moisture can be prevented.Furthermore, the form of the outer periphery of the adhesive for pastingthe transparent cover to the display panel in a plane is uneven, andthus, the adhesive can be prevented from sagging when the display paneland the transparent cover are pasted together.

In addition, according to the present invention, an adhesive intervenesbetween the transparent cover and the drive circuit in the case wherethe drive circuit mounted on the display panel is coated with atransparent cover, and thus, the transparent cover can be prevented fromcracking when pressed.

In addition, according to the present invention, an opening is createdin the light blocking film of the transparent cover in the case where anadhesive which can be hardened through irradiation with light is used asthe adhesive for pasting the transparent cover to the display panel, andtherefore, the adhesive can be sufficiently hardened.

Other effects of the present invention will become clearer from thedescription throughout the entire specification.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a cross sectional diagram showing the display device accordingto the first embodiment of the present invention;

FIG. 2 is a perspective diagram showing illustrating the manner in whichthe display panel and the transparent cover are pasted togetheraccording to one example of the present invention;

FIG. 3 is a plan diagram showing the transparent cover according to oneembodiment of the present invention;

FIG. 4 is a plan diagram showing an example of the form of the adhesivein a plane;

FIG. 5 is a plan diagram showing another example of the form of theadhesive in a plane;

FIG. 6 is a plan diagram showing still another example of the form ofthe adhesive in a plane;

FIG. 7 is a cross sectional diagram illustrating the display deviceaccording to the second embodiment of the present invention;

FIG. 8 is a cross sectional diagram illustrating the display deviceaccording to the third embodiment of the present invention;

FIG. 9 is a cross sectional diagram illustrating the display deviceaccording to a modification of the third embodiment of the presentinvention;

FIG. 10 is a cross sectional diagram showing the display deviceaccording to the fourth embodiment of the present invention;

FIG. 11 is a cross sectional diagram illustrating the configuration of aconventional liquid crystal display device; and

FIG. 12 is a cross sectional diagram illustrating a problem with theconventional liquid crystal display device shown in FIG. 11.

EXPLANATION OF SYMBOLS

-   SUB1, SUB2 . . . substrates-   SL . . . sealing material-   LC . . . liquid crystal layer-   POL1, POL2 . . . polarizing plate-   COV . . . transparent cover-   BLK . . . light blocking film-   WD . . . window-   OP . . . opening-   ADH . . . adhesive-   AR . . . display region-   IRG . . . inconsistent gap region-   d . . . distance-   DRV . . . drive circuit-   RES . . . terminal protecting resin-   FPC . . . flexible wire substrate-   BL . . . backlight

DETAILED DESCRIPTION OF THE INVENTION Best Mode for Carrying Out theInvention

The embodiments of the present invention are described in reference tothe drawings. Here, the same symbols are attached to components whichare the same or similar in the respective diagrams and embodiments, anddescriptions which are the same are omitted.

First Embodiment

FIG. 1 is a cross sectional diagram showing the display device accordingto the first embodiment of the present invention. FIG. 2 is aperspective diagram showing the manner in which the display panel andthe transparent cover are pasted together according to an example of thepresent invention. FIG. 3 is a plan diagram showing the transparentcover according to one example of the present invention.

Here, a case where a liquid crystal display panel is used as the displaypanel is described as an example. As shown in FIG. 1, the liquid crystaldisplay panel has an insulating, transparent first substrate SUB1 andsecond substrate SUB2 formed of glass, for example. In addition, thefirst substrate SUB1 and the second substrate SUB2 are pasted togetherusing a sealing material SL. A liquid crystal layer LC is sandwichedbetween the first substrate SUB1 and the second substrate SUB2. Asealing material SL is formed in the peripheral portion outside thedisplay region AR of the liquid crystal display panel so as to surroundthe liquid crystal layer LC. In FIG. 1, the second substrate SUB2 sideis the viewer side (front side). In the present embodiment, the firstsubstrate SUB1 and the second substrate SUB2 both have a thickness of0.3 mm and the liquid crystal layer LC has a thickness of 4 μm, but theinvention is not limited to this.

A number of pixels are aligned in a matrix in the display region AR ofthe liquid crystal display panel. A number of scanning signal lines, anumber of video signal lines which cross the number of scanning signallines, a number of switching elements, for example thin filmtransistors, and a number of pixel electrodes are formed on the surfaceof the first substrate SUB1 on the liquid crystal layer LC side. Inaddition, one or more facing electrodes are formed on the surface of thefirst substrate SUB1 or the second substrate SUB2 on the liquid crystallayer LC side. The liquid crystal molecules in the liquid crystal layerLC are controlled by the electrical field generated by the difference inpotential between the pixel electrodes and the facing electrodes, sothat an image is displayed.

In addition, the liquid crystal display panel has a polarizing platePOL1 which is provided on the surface of the first substrate SUB1 on theside opposite to the liquid crystal layer LC, and a polarizing platePOL2 which is provided on the surface of the second substrate SUB2 onthe side opposite to the liquid crystal layer LC. In the presentembodiment, the thickness of the polarizing plate POL1 and the thicknessof the polarizing plate POL2 are both 150 μm, but the invention is notlimited to this.

A backlight BL having a light source is provided on the rear surfaceside of the liquid crystal display panel.

A transparent cover COV is pasted on the surface of the liquid crystaldisplay panel on the viewer side using an adhesive ADH. As shown in FIG.2, the adhesive is applied on the rear surface side of the transparentcover COV, for example, which is pasted to the liquid crystal displaypanel in a vacuum, and after that, the adhesive ADH is hardened usinglight, heat or both light and heat. It is desirable for the thickness ofthe adhesive ADH to be in a range from 30 μm to 200 μm in the portionbetween the transparent cover COV and the polarizing plate POL, and itis more desirable for it to be in a range from 30 μm to 100 μm. In thepresent embodiment, for example, the thickness is 50 μm. An adhesive ADHof which the index of refraction is only slightly different from that ofthe transparent cover COV (it is desirable for the difference in theindex of refraction to be 0.2 or less), for example an acryl resin or anepoxy resin, can be used, and thus, it is possible to reduce unnecessaryreflection in the interface.

The transparent cover COV is formed of a transparent material, such asglass or an acryl resin, and works as a protective cover panel. It isdesirable for the thickness to be 0.5 mm to 2.5 mm, and in the presentembodiment, the thickness is 1.8 mm. As shown in FIGS. 1 and 3, thetransparent cover COV has a light blocking film BLK. The light blockingfilm BLK of the transparent cover COV has a window WD from which thedisplay region AR is exposed. Accordingly, the light blocking film BLKis formed as a frame surrounding the display region AR on the outside.

As shown in FIG. 2, the liquid crystal display panel has a region wherethe first substrate SUB1 protrudes from the second substrate SUB2 on atleast one side, and a drive circuit DRV formed of a semiconductor chipor the like may be mounted in this protruding region. In addition, aterminal for connection to the outside may be formed in the protrudingportion, so that a flexible wiring board FPC may be connected to thisterminal. In addition, the transparent cover COV may cover the region ofthe first substrate SUB1 which protrudes from the second substrate SUB2.In this case, as shown in FIG. 3, it is desirable for the width of thelight blocking film BLK of the transparent cover COV on the sidecorresponding to the protruding region to be greater than the width ofthe light blocking film on the other sides.

FIG. 1 is a cross sectional diagram along line A-A′ in FIG. 3. Here,though the first substrate SUB1 protrudes from the second substrate SUB2in FIG. 1, the invention is not limited to this, and the location of theend portions of the first substrate SUB1 and the second substrate SUB2may approximately coincide on the sides other than the side on which adrive circuit DRV or flexible wiring board FPC are mounted. This is thesame in the other embodiments.

In the present embodiment, as shown in FIG. 1, an end portion of theadhesive ADH protrudes from the end portion of the polarizing plate POL2by a distance D. This adhesive ADH protrudes on all four sides aroundthe circumference of the polarizing plate POL2. As a result, theentirety of the sides of the polarizing plate POL2 can be coated withthe adhesive ADH, and therefore, inconsistency in the display resultingfrom expansion of the polarizing plate POL2 in the vicinity of the endportions caused by moisture as shown in FIG. 12 can be prevented.

When the adhesive ADH protrudes in this manner, however, there is apossibility that a problem may arise, such that the adhesive ADH sagsfrom the second substrate SUB2 when the transparent cover COV and theliquid crystal display panel shift in position when pasted together.

Therefore, the form of the outer periphery of the adhesive ADH in aplane is uneven, and thus, the adhesive ADH can be prevented fromsagging. FIGS. 4, 5 and 6 are plan diagrams illustrating examples of theform of the adhesive in a plane. FIGS. 4, 5 and 6 are enlargements ofthe upper right portion in FIG. 3. Accordingly, the cross sectionaldiagram along line A-A′ in FIGS. 4, 5 and 6 is FIG. 1.

As shown in FIGS. 4 and 5, the form of the outer periphery of theadhesive ADH in a plane is uneven, and thus, extra adhesive ADH can beabsorbed in the recesses when the transparent cover and the liquidcrystal display panel are pasted together, and thus, the adhesive ADHcan be prevented from sagging, as compared to the case where the form ofthe adhesive is not uneven, as in FIG. 6. Here, from the point of viewof preventing inconsistency in the display resulting from expansion ofthe polarizing plate POL2 in the vicinity of an end portion caused bymoisture, it is desirable for the distance d by which the adhesive ADHprotrudes from the polarizing plate POL2 to be 0.1 mm or more, evenwhere it protrudes the least.

Second Embodiment

FIG. 7 is a cross sectional diagram showing the display device accordingto the second embodiment of the present invention. FIG. 7 is a crosssectional diagram showing a portion corresponding to FIG. 1. The basicconfiguration in the second embodiment is the same as in the firstembodiment. The difference from the first embodiment is the location ofthe end portion of the polarizing plate POL2.

A case where the end portion of the polarizing plate POL2 is in such alocation as to overlap with the sealing material SL is shown as anexample of the above described embodiment in FIG. 1. However, there is aproblem with this case, such that the adhesive ADH cannot protrude bymuch of a distance d. Thus, in the second embodiment, which is thepresent embodiment, an end portion of the polarizing plate POL2 islocated on the side closer to the display region AR than the sealingmaterial SL provided around the display region AR.

As a result, it becomes easy to secure a large distance d. Accordingly,even adhesive ADH of which the form is uneven, as shown in FIGS. 4 and5, can be prevented from sagging, and can prevent moisture from enteringwithout fail.

In addition, in the present embodiment, as shown in FIG. 6, it ispossible to adopt a configuration where the form of the adhesive ADH ina plane is not uneven. According to the present embodiment, a sufficientdistance between the end portion of the adhesive ADH and the end portionof the second substrate SUB2 (or end portion of the transparent coverCOV) can be secured, even when the distance d is fairly great.Accordingly, it becomes possible to prevent the problem with theadhesive ADH sags from the second substrate SUB as a result of a largemargin, even when the transparent cover COV and the liquid crystaldisplay panel shift in position when pasted together.

Third Embodiment

FIG. 8 is a cross sectional diagram showing the display device accordingto the third embodiment of the present invention. FIG. 8 is a crosssectional diagram along line B-B′ in FIG. 3. The basic configuration inthe third embodiment is the same as in the first and second embodiments,and therefore, mainly portions which are different in the configurationare described.

In the present embodiment, a drive circuit DRV is mounted in the regionof the first substrate SUB1 which protrudes from the second substrateSUB2, as described in the first embodiment. In addition, the transparentcover COV is provided so as to cover the drive circuit DRV. In the casewhere the transparent cover COV is provided so as to cover the drivecircuit DRV and there is a space between the two, however, there is apossibility that a problem may arise, such that the transparent coverCOV cracks when pressed.

Therefore, in the present embodiment, the adhesive ADH is also providedbetween the transparent cover COV and the drive circuit DRV, as shown inFIG. 8. As a result, the problem with the transparent cover COV crackingwhen pressed can be prevented.

Here, the adhesive ADH may be provided around the periphery of the drivecircuit DRV. In addition, a terminal protecting resin RES may beprovided around the periphery of the drive circuit DRV.

FIG. 9 is a cross sectional diagram showing the display device accordingto a modification of the third embodiment of the present invention. FIG.9 is a cross sectional diagram showing a portion corresponding to FIG.8. As shown in FIG. 9, the adhesive ADH may be provided as dots, linesor a lattice in the peripheral region of the drive circuit DRV in such astate that the surface is uneven. In this case, though there may be asmall space, the problem with the transparent cover COV cracking whenpressed can be prevented, even in the case of the configuration shown inFIG. 9.

Fourth Embodiment

FIG. 10 is a cross sectional diagram showing the display deviceaccording to the fourth embodiment of the present invention. FIG. 10 isa cross sectional diagram along line B-B′ in FIG. 3. The basicconfiguration in the fourth embodiment is the same as in the first tothird embodiments, and therefore, mainly portions having a differentconfiguration are described.

In the case where an adhesive which can be hardened through irradiationwith light, for example an ultraviolet ray curing type adhesive, or anadhesive having the properties of both thermosetting type andultraviolet ray curing type adhesives is used as the adhesive ADH, aproblem arises, such that it is difficult to harden the adhesive ADHsufficiently in the region where the transparent cover COV overlaps withthe light blocking film BLK.

Therefore, in the present embodiment, as shown in FIG. 10, an opening OPis provided in another location from the window WD in the light blockingfilm BLK of the transparent cover COV. As a result, it becomes possibleto irradiate the adhesive ADH in the portion where it overlaps with theopening OP and its periphery with light, and thus, it become possible tosufficiently harden the adhesive ADH.

Here, in FIG. 10, the problem is significant in the portion where thewidth of the light blocking film BLK is great in FIG. 3, and therefore,an opening OP is provided in the light blocking film BLK on the bottom,but the invention is not limited to this, and openings OP may beprovided in the light blocking film BLK having a small width, forexample in the top, the right and the left in FIG. 3.

The opening OP may be in any pattern, for example dots, lines or alattice.

Fifth Embodiment

In the first to fourth embodiments, a touch panel may be used as thetransparent cover COV.

Though first to fifth embodiments of the present invention are describedin the above, the configurations described in the respective embodimentsare merely examples, and appropriate modifications of the presentinvention are possible within such a scope not to deviate from thetechnical idea. In addition, the configurations described in therespective embodiments may be combined for use, unless they areincompatible.

In addition, though a liquid crystal display device using a liquidcrystal display panel is described as an example in the first to fifthembodiments, the present invention may be applied to display devicesusing other types of display panels.

1. A display device, comprising: a liquid crystal display panel having afirst substrate, a second substrate provided on the viewer side of saidfirst substrate and a liquid crystal layer sandwiched between said firstsubstrate and said second substrate; and a transparent cover pasted onthe surface of said liquid crystal display panel on said viewer sideusing an adhesive, characterized in that said liquid crystal displaypanel has a polarizing plate between said second substrate and saidtransparent cover, said adhesive covers the entirety of a side of saidpolarizing plate, a drive circuit is mounted in a region of said firstsubstrate which protrudes from said second substrate, said transparentcover covers said drive circuit, and said adhesive is provided betweensaid transparent cover and said drive circuit, said transparent coverhas a light blocking film in the region where said drive circuit ismounted, said adhesive is an adhesive which can be cured throughirradiation with light, and said light blocking film has an opening in aportion of the region where said drive circuit is mounted.
 2. Thedisplay device according to claim 1, characterized in that the form ofthe outer periphery of said adhesive in a plane is uneven.
 3. Thedisplay device according to claim 1, characterized in that the thicknessof said adhesive between said transparent cover and said polarizingplate is in a range from 30 μm to 200 μm, and the amount of saidadhesive protruding from around said polarizing plate is 0.1 mm or more.4. The display device according to claim 1, characterized in that thethickness of said adhesive between said transparent cover and saidpolarizing plate is in a range from 30 μm to 100 μm, and the amount ofsaid adhesive protruding from around said polarizing plate is 0.1 mm ormore even where it protrudes the least.
 5. The display device accordingto claim 1, characterized in that said liquid crystal display panel hasa sealing material for pasting said first substrate and said secondsubstrate together, which is provided around the display region, and anend portion of said polarizing plate overlaps with said sealingmaterial.
 6. The display device according to claim 1, characterized inthat said liquid crystal display panel has a sealing material forpasting said first substrate and said second substrate together, whichis provided around the display region, and an end portion of saidpolarizing plate is located on the side closer to said disp region thansaid sealing material.
 7. The display device according to claim 1,characterized in that said transparent cover is a touch panel.